Would be useful for some existing topics, which got spammy over time after a few dozen pages.
Just lock it, and (before locking it) make the last post
point towards a new self-moderated topic.
And sometimes, I just miss to select self-moderated and dont know how to change it after the topic is created.
I often forget it. Just create a new topic, and move the old one to Archival.
Ive tried to find it, didnt see any option.
You can't self-moderate on this board (Meta).